给出了丙烷（R-290）、异丁烷（R-600a）以及丙烷和异丁烷的50/50混合物（按重量计）的单相流、蒸发和冷凝管侧传热系数。根据纯制冷剂文献中可用的标准关联式，给出了光滑管的传热系数。R-12和其他制冷剂的蒸发和冷凝相关性之前已得到验证。制冷剂的质量流量在很大范围内变化，这在住宅、商业和汽车应用中通常会遇到。 蒸发温度为-6.7°C（20°F）和4.4°C（40°F），冷凝温度为37.8°C（100°F）和48.9°C（120°F）。将碳氢化合物（R-290、R-600a、R-290/R-600a）的传热系数与R-12和R-134a进行了比较。国家标准与技术研究所（NIST）开发的REFPROP计算机程序已用于确定R-290、R-600a和R-290/R-600a的热力学性质。这项研究表明，碳氢化合物的传热系数明显高于R和R- 12和R-134a。在所研究的制冷剂温度和质量流量范围内，碳氢化合物的单相蒸汽传热系数比R-12大234%到259%，比R-134a大167%到181%。碳氢化合物的单相液体传热系数比R-12大193%到245%；与R-134a相比，其含量高出155%至198%。碳氢化合物的平均蒸发传热系数比R大194%到238%- 与R-134a相比，12%和192%更高。最后，与R-12相比，平均冷凝系数大220%至233%，与R-134a相比，平均冷凝系数大177%至187%。表3至表6总结了碳氢化合物与R-12和R-134a相比的传热系数增强。单位:双引证:研讨会，ASHRAE交易，1998年，第104卷，第2部分，多伦多

Tube-side heat transfer coefficients for single-phase flow, evaporation, and condensation are presented for propane (R-290), isobutane (R-600a), and a 50/50 mixture (by weight) of propane and isobutane. Heat transfer coefficients have been presented for smooth tubes based on the standard correlations available in the literature for pure refrigerants. The correlations for evaporation and condensation have previously been verified for R-12 and other refrigerants. The mass flux of the refrigerant is varied over a wide range that is typically encountered in residential, commercial, and automotive applications. Evaporation temperatures of -6.7°C (20°F) and 4.4°C (40°F) and condensation temperatures of 37.8°C (100°F) and 48.9°C (120°F) have been used for this investigation. The heat transfer coefficients for hydrocarbons (R-290, R-600a, R-290/R-600a) have been compared with R-12 and R-134a. The REFPROP computer program developed by the National Institute of Standards and Technology (NIST) has been used to determine the thermodynamic properties for R-290, R-600a, and R-290/R-600a.This study shows that the heat transfer coefficients for hydrocarbons are significantly higher than those for both R-12 and R-134a. For the range of refrigerant temperatures and mass flux studied, single-phase vapor heat transfer coefficients for hydrocarbons are greater by 234% to 259% in comparison to R-12 and are greater by 167% to 181% in comparison to R-134a. The single-phase liquid heat transfer coefficients for hydrocarbons are greater by 193% to 245% in comparison to R-12; and are greater by 155% to 198% in comparison to R-134a. Average evaporative heat transfer coefficients for hydrocarbons are greater by 194% to 238% in comparison to R-12 and are greater by 157% to 192% in comparison to R-134a. Finally, average condensing coefficients are greater by 220% to 233% in comparison to R-12 and are greater by 177% to 187% in comparison to R-134a.Tables 3 through 6 show a summary of the heat transfer coefficient enhancement of the hydrocarbons in comparison to both R-12 and R-134a.Units: Dual